Doing all the "injury protection" exercise does no good if you fall off your motorcycle at speed, get hit by a car, or age beyond 55.

Yes, you are correct that injury prevention will not help falling off a motorcycle at high speed or getting hit by car. Perhaps a good helmet and leather protection? Sorry, not an authority on preventing injuries from motorcycle accidents.

I should have been more clear and said the following: "INJURY PREVENTION FOR TENNIS"

I do not agree with your statement about aging beyond 55. I know several 55+ players who have kept themselves very young and in amazing shape through physical training and tennis. I am guessing that you have not seen a 60+ USTA nationals event?